so the canon event for reina is her closest friend
she can't have 2 closest friend, one of them must die (hikaru or kokoro)
Honestly at this point I'm not sure what the next gut punch will be?
Kokoro will surely talk with her dead spirit self at some point, otherwise the god wouldn't have told her to come to Hoga in World 1.
Maybe they will have to trade places, so that each Kokoro is in their own world? Leaving Reina 1 with neither of her friends?
Imagine if the reason Kokoro in World 2 couldn't pass on, is that she just wanted to go home (W1)... The girl was spirited away at 6, in a strange world that isn't hers and killed by a ghost.
Why do we only get anime of shit Isekai Watcher Insert Harem With FUNNY LONG Title #14145 and not this one man....